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<table width="100%" summary="page for psid1"><tr><td>psid1</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Labour Training Evaluation Data</h2>

<h3>Description</h3>

<p>A non-experimental &quot;control&quot; group, used in various studies of
the effect of a labor training program, alternative to the
experimental control group in <code>nswdemo</code>.
</p>


<h3>Usage</h3>

<pre>psid1</pre>


<h3>Format</h3>

<p>This data frame contains the following columns:
</p>

<dl>
<dt>trt</dt><dd><p>a numeric vector 
identifying the study in which the subjects were enrolled
(0 = Control, 1 = treated).</p>
</dd>
<dt>age</dt><dd><p> age (in years).</p>
</dd>
<dt>educ</dt><dd><p> years of education.</p>
</dd>
<dt>black</dt><dd><p> (0 = not black, 1 = black).</p>
</dd>
<dt>hisp</dt><dd><p> (0 = not hispanic, 1 = hispanic).</p>
</dd>
<dt>marr</dt><dd><p> (0 = not married, 1 = married).</p>
</dd>
<dt>nodeg</dt><dd><p> (0 = completed high school, 1 = dropout).</p>
</dd>
<dt>re74</dt><dd><p> real earnings in 1974.</p>
</dd>
<dt>re75</dt><dd><p> real earnings in 1975.</p>
</dd>
<dt>re78</dt><dd><p> real earnings in 1978.</p>
</dd> 
</dl>



<h3>Details</h3>

 
<p>The <code>cps1</code> and <code>psid1</code> data sets are two non-experimental
&quot;control&quot; groups, alternative to that in <code>nswdemo</code>, used in
investigating whether use of such a non-experimental control group can
be satisfactory. <code>cps2</code> and <code>cps3</code> are subsets of <code>cps1</code>,
designed to be better matched to the experimental data than <code>cps1</code>.
Similary <code>psid2</code> and <code>psid3</code> are subsets of <code>psid1</code>,
designed to be better matched to the experimental data than
<code>psid1</code>.
</p>


<h3>Source</h3>

<p><a href="http://www.nber.org/~rdehejia/nswdata.html">http://www.nber.org/~rdehejia/nswdata.html</a>
</p>


<h3>References</h3>

<p>Dehejia, R.H. and Wahba, S. 1999. Causal effects in
non-experimental studies: re-evaluating the evaluation of training
programs. <em>Journal of the American Statistical Association</em> 94:
1053-1062.
</p>
<p>Lalonde, R. 1986. Evaluating the economic evaluations of
training programs. <em>American Economic Review</em> 76: 604-620.
</p>
<p>Smith, J. A. and Todd, P.E. &quot;Does Matching overcome. LaLonde?s
critique of nonexperimental estimators&quot;, <em>Journal of
Econometrics</em> 125: 305-353.
</p>
<p>Dehejia, R.H. 2005. Practical propensity score matching: a reply to
Smith and Todd. <em>Journal of Econometrics</em> 125: 355-364.
</p>


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